Astronomical Algorithms, Tables of Meeus

[Gil]

The book is really a "must", with full detailed formulae and examples.

I used it to implement the formulae relative to my EPHEMERID.4XI.D.HP program (formerly for Earth ecliptic, nutation, Julian Dates, seasons) on my HP50G (EMU48 version).

Jean Meeus gives 3 ways to calculate the season.
I chose the intermediate one, that gives DT results within 50 seconds of precision.

I tried to use his abridged tables, but there I get some small differences with the results given by the author. It's strange, because normally all the working examples should be exact to the last but one digit.

Regards,
Gil